I didn't. I looked around to see what was recommended and it seemed that a lot of people did but for those that didn't the dye didn't stick to the metal pieces. I found that there was minimal staining on the stonewashed blades, but nothing more. I am curious how corrosive it is since these were all stainless blades, but the cts-xhp had a little staining on the edge. The color is pretty close to rust though so hard to tell. Stropped right off.